- var_dump: documentation ( source)
- preg_match_all: documentation ( source)
<?php
$html_string = '<!DOCTYPE html>
<html>
<body>
<div id="foo">
This is a paragraph with
<strong>Some nested tags</strong>
</div>
<div class="test" id="bar">
<div>
And a nested div?
</div>
</div>
<div class="baz test">
<p>
Pretty normal HTML.
</p>
</div>
</body>
</html>';
$regex = '/<div[^>]*?(class="(.+?)"[^>]*)?>((?:.*?(?:(?!<div)|(?R))*)*)' .
'<\/div>/sm';
if (preg_match_all($regex, $html_string, $matches, PREG_SET_ORDER)) {
var_dump($matches);
}